Fr.: rythme circardien
Any of several physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness in an organism's environment. Circadian rhythms are found in most living things, including animals, plants and many tiny microbes.
1) An ordered recurrent alternation of strong and weak elements in the
flow of sound and silence in speech; a particular example or form of rhythm.
From L. rhythmus "movement in time," from Gk. rhythmos "measured flow or movement, rhythm; proportion, symmetry; arrangement," related to rhein "to flow," from PIE root *sreu- "to flow"
Ritm, loan from Fr.